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Fern s.l. (Pteridophyta)

      A fern is any one of a group of about 12,000 species of plants belonging to the botanical group known as Pteridophyta.Unlike mosses, they have xylem and phloem (making them vascular plants). They have stems, leaves, and roots like other vascular plants. Ferns reproduce via spores and have neither seeds nor flowers. By far the largest group of ferns are the leptosporangiate ferns, but ferns as defined here (also called monilophytes) include horsetails, whisk ferns, marattioid ferns, and ophioglossoid ferns. The term pteridophyte also refers to ferns and a few other seedless vascular plants (see classification section below). A pteridologist is a specialist in the study of pteridophytes in a broader sense that includes the more distantly related lycophytes. Ferns first appear in the fossil record 360 million years ago in the Carboniferous but many of the current families and species did not appear until roughly 145 million years ago in the late Cretaceous (after flowering plants came to dominate many environments).

Source: http://en.wikipedia.org/wiki/Fern


 

ZS_39
Annularia stellata ZŠ39
ZS_317
Annularia stellata ZŠ317
ZS_197
Asterophyllites longifolius ZŠ197
ZS_168
Pecopteris cyathea ZŠ168
ZS_171
Pecopteris lepidorachis ZŠ171
ZS_315
Pecopteris polypodioides ZŠ315
ZS_315
Pecopteris polypodioides ZŠ315
ZS_50
Pecopteris raconicensis ZŠ50
ZS_36
Pecopteris raconicensis ZŠ36
XA282
Pseudosporochnus krejcii XA282
XA283
Pseudosporochnus krejcii XA283
XA257
Pseudosporochnus krejcii XA257
YA1387a
Valvisisporites nitens Kalibová, 1959 YA1387
YA1387
Valvisisporites nitens Kalibová, 1959 YA1387
 

In the Virtual Museum there are total 529 samples

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]